BOSTON -- A corporate watchdog group says its running an ad in a special national parks supplement to USA Today on Monday that calls on the beverage giant to stop interfering in efforts by national parks to go bottled water free.

Corporate Accountability International's quarter-page ad, which will run on May 20, reads: "Bottled water has no place in our parks," alongside a picture of a mound of trash in an otherwise pristine environment. It also urges readers to "Support the parks in telling Coke to take a hike."

The ad is the latest effort in the group's national Think Outside the Bottle campaign to support parks in reducing bottled water waste. Separately, there's been a growing movement of national parks banning disposable plastic bottles, including the Grand Canyon. Instead, the parks install water bottle filling stations at which visitors refill their own reusable containers. | SEE STORY

Coke reportedly plans to run a full-page ad in the same USA Today National Parks guide.